Wormholes are hypothetical entities representing sections of spacetime that are warped in such a way as to connect two locations in space and time, possibly over great distances.
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- White Holes and Wormholes Illustrations of White Hole and wormhole geometry, plus a visualization of what the view through a wormhole would look like. One of Andrew Hamilton's excellent pages about visualizing relativity.
- Why Wormholes? Brief article by Matt Visser (Victoria University of Wellington) about why the concept of a wormhole, originally more science fiction than science, has become interesting for serious physicists.
- What Exactly Is a "Wormhole"? Have wormholes been proven to exist or are they still theoretical? From Scientific American's "Ask the experts", with answers by Richard F. Holman, William A. Hiscock, and Matt Visser.